继承-people

创建如下三个类：（People类中的三个方法分别输出一些信息，ChinaPeople

和AmericanPeople类重写父类的三个方法）。

 1 package com.hanqi.z1p1;
 2
 3 public class People {
 4
 5     protected double height;
 6     protected double weight;
 7
 8     public void speakHello()
 9     {
10         System.out.println("Hello!");
11     }
12     public void averageHeight()
13     {
14         System.out.println("平均身高");
15     }
16     public void averageWeight()
17     {
18         System.out.println("平均体重");
19     }
20
21 }

 1 package com.hanqi.z1p1;
 2
 3 public class ChinaPeople extends People {
 4
 5     public void chinaGongfu()
 6     {
 7         System.out.println("坐如钟，站如松，睡如弓");
 8     }
 9
10     public void speakHello()
11     {
12         System.out.println("你好");
13     }
14     public void averageHeight()
15     {
16         System.out.println("中国平均身高为170");
17     }
18     public void averageWeight()
19     {
20         System.out.println("中国平均体重为140");
21     }
22 }

 1 package com.hanqi.z1p1;
 2
 3 public class AmericanPeople extends People{
 4
 5     public void americanBoxing()
 6     {
 7         System.out.println("直拳，勾拳");
 8     }
 9
10     public void speakHello()
11     {
12         System.out.println("Hi");
13     }
14     public void averageHeight()
15     {
16         System.out.println("美国平均身高为170");
17     }
18     public void averageWeight()
19     {
20         System.out.println("美国平均体重为140");
21     }
22
23
24
25 }

package com.hanqi.z1p1;

public class TestPeople0522 {

    public static void main(String[] args) {
        // TODO 自动生成的方法存根

        People p=new People();
        p.speakHello();
        p.averageHeight();
        p.averageWeight();

        ChinaPeople cp=new ChinaPeople();
        cp.speakHello();
        cp.averageHeight();
        cp.averageWeight();

        AmericanPeople ap=new AmericanPeople();
        ap.speakHello();
        ap.averageHeight();
        ap.averageWeight();

    }

}

运行结果：